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ATTORNEYS.

UNITED STATES nTnNT JOSEPH lV. BALET, OF NEYV YORK, il. Y., ASSGNOR OFONE-HALF TO ROBERT DUNLAP AND LUKE F. OOZANS, OF SAME PLAGE.

DYNAMO-ELECTRiC iViACHiNE.

SPECIFICATION forming part of Letters Patent No. 899,646, dated March19, i889. Application filed February l, 1883. Serial No. 262,634. (Nomodel.)

To @ZZ whom, t may concer-7L.-

Be it known that I, JOSEPH WILHELMUS BALET, a subject of the King of theNetherlands, at present residing' in the city, county, and State of N eWYork, have invented a new and Improved Dymano-Electric Machine, of Whichthe following is a specification, reference being had to the annexeddrawings, forming a part thereof, in Which- Figure l is a partiallongitudinal section of the field-magnet and a transverse section of thearmature, taken on the line A B of Figs. 3 and 4L. Fig. 2 is a partialside elevation. Fig. 3 is a partial vertical transverse section taken onthe line C D in Fig. and Fig. l-is a partial transverse section of thefield-magnet and a longitudinal section of the armature, taken on theline E F in Fig. l.

Similar letters of reference indicate corresponding parts in all t-heviews.

The object of my invention is to build a dynamo-electric machine inwhich the fluctuations of the current induced in the armature will notreact upon the field-magnet, so as to modify the lines of force andcause the current to liuctuate.

My object is, further, to produce an armature in which thoroughventilation is secured, thereby preventing' the armature from becomingWarm.

My invention consists in a dynamo-electric .machine having anarmature-core grooved longitudinally with respect to the armature andtransversely With respect to the fieldmagnet,and in the combinationtherewith of one or more conductors Wound in the grooves of thearmature.

It also further consists in a ventilating device, whereby thetemperature of the armature is kept doWn by a forced circulation of air,all as hereinafter more fully described.

The field-magnet A, which is of the usual form, is provided withpole-pieces B B', which are connected by non-magnetic frames C C',attached to the sides of the pole-pieces of the field-magnet. The lowerpolar extremity, B', of the field-magnet is formed lintegrally with thebase D, the said base being provided with a standard, E, for supporting'the journal-box F of the armature-shaft G. One end of the armature-shaftGis journaled in the box F, and the opposite end is journaled in ajournal-box, H, supported by arms a, connected with the frame C. Thefieldmagnets are Wound in the usual Way, and maybe placed in the circuitin accordance with the requirements of the case.

The hub g on the armature-shaft is threaded to receive the collars l l,which are provided ivith the concave shoulders l) for receiving the endsand inner portions of the armatmre-ring J. The core K of thearmature-ring is preferably laminated and formed in several sections, b,and intervening airspaces c. The armature-core thus formed of lamime andprovided With the air-spaces is furnished with series of longitudinalgrooves d, extending from the periphery of the armature toward thecenter thereof radially, and in the bottom of each groove is placed aconductor, c. The conductor is Wound in the grooves over the ends of thering and Within the ring in the usual Way, and each section 0f theconductor thus arranged is connected With the bar f of thecommutator-cylinder L.

The commutator-cylinder L is mounted upon the shaft G With the severalparts insulated from the shaft and from each other in the usual Way. Thecore of the armaturering J is mounted upon arms g, connected with thehub g on the armature-shaft G, said arms being received in grooves inthe hub g and in the inner surface of the armaturecore. rlhe collars l Iare apertured and provided With oblique Wings or vanes 71, Which areadapted to gather the air and force it into the interior of the armatureto be carried outward by centrifugal. force through the airspaces c.rlhe commutatorcylinder L is touched by brushes M, held by studs N,received in the arm O,but prevented from electrical contact with thesaid arm by insulatingdisksj. The arm O is arranged to turn inwardlyupon a sleeve formed of the extensions of the journal-box F. Thelongitudinal grooves d can be cut in parallel with the axis of thearmature-core, or they can be cutin so as to form a spiral line on thearmature, or one-half can be cut in so as to form a lefthanded spiralline and the other half so as to form a right-handed spiral line, thusenabling the grooves d to contribute to a thorough ventil-ation of thearmature. It will be understood that the grooves d can also be appliedin the drum-armature- By arranging the conductors of my armature withinthe periphery of the armaturecore in the manner described I am enabledto cut the lines of force by the armature-core and to induce in thearmature very strong magnetism, which acts inductively upon theconductor of the armature, producing a current which is taken opfrom thecommutator by the commutator-brushes in the Well-known way. By placingmy conductor so far within the periphery of the armature-core, I amenabled to c void the reactionary effect upon the field-magnet producedby fluctuations in the current in the circuit of the dynamo, and byseparating the conductors by the radial projections of the armature, Iam enabled to prevent self-induction in the conductor. The radial slotsin which the conductor is received also act to force the magnetic linesof force to low Without any leakage through the conductor and thearmature-core. The oblique wings or vanes 7L on the collars I gather asufcient quantity of air to keep down the temperature of both theconductor and the armature-core. By means of these several improvementsI attain a high efficiency without any disadvantages in the constructionof the machine.

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. In a dynamo-electric machine, an armature-coreprovided with longitudinal grooves extending inward from the peripherythereof to a depth much greater than the diameter of the conductor, anda conductor arranged at the bottom of the grooves and in close proximityto the Walls of the grooves, substantially as specified.

2. In a dynamo-electric machine, the combination, with the hollowarmature-core, of collars arranged to partly support the armature-coreand provided with apertures and inclined Wings h for introducing airinto the interior of the armature, substantially as specified.

3. In a dynamo-electric machine, the combination, vwith the ield-magnetsA, provided with polar extremities B, adapted to inclose the sides ofthe armature, of the armature having the laminatedlongitudinally-grooved core K, the grooves extending inward from theperiphery of the core to a depth much greater than the diameter of theconductor, the con` ductor in the bottom of the said grooves, and thecommutator and electrical connections, substantially as described.

JOSEPH lV. BALET. W'itnesses:

EDGAR TATE, GEO. M, HOPKINs.

